Waec Physics 2006 Past Questions and Answers

Question 16:

• WAEC 2006

Which of the following statements about the mouth piece of a telephone is correct? It converts sound energy into

A. Acoustic energy
B. Mechanival energy
C. Electrical energy
D. Heat energy

Question 17:

• WAEC 2006

The potential energy in an elastic string of force constant K which has been extended by X metres is expresses as

A. \(\frac{1}{2}k \Box ^2\)
B. \(k \Box ^2\)
C. \(\frac{1}{2}k \Box \)
D. \(k \Box \)

Question 18:

• WAEC 2006

The engine of a train produces a force of 3000N when moving at 30.ms^-1. calculate the power of the engine

A. 1.00 x 10²W
B. 3.00 x 10⁴W
C. 9.00 x 10⁴W
D. 3.00 x 10⁵W

Question 19:

• WAEC 2006

The velocity ratio of an inclined plane, inclines at an angle \(\theta\) to the horizontal can be expressed as

A. (sin \(\theta)^{-1}\)
B. \(\sin \theta\)
C. (cos \(\theta)^{-1}\)
D. \(\cos \theta\)

Question 20:

• WAEC 2006

A block and tackle system has six pulleys. a force of 50N applied to it lifts a load of weight W. If the efficiency of the system is 40%, calculate W

A. 300N
B. 200N
C. 140N
D. 120N